Add some tests for callables (incomplete, but it's a start)
Add some tests for callables (incomplete, but it's a start)

ceylon/ceylon.language,jvasileff/ceylon.language,unratito/ceylon.language,lucaswerkmeister/ceylon.language,ceylon/ceylon.language,lucaswerkmeister/ceylon.language,unratito/ceylon.language,jvasileff/ceylon.language